unimproved

adjective

1. not developed to full potential, as resources or the mind.
2. not showing improvement, as one’s health, appearance, etc.
3. (of land) not fitted for a profitable use, as by clearing, cultivation, addition of facilities for dwelling or business purposes, or the like.
4. not used to advantage; neglected: an unimproved opportunity.
5. (of animal or plant species) not made more useful or attractive by selective breeding or cultivation.
6. not enhanced; not increased: Our chance of success is unimproved.

adjective

1. not improved or made better
2. (of land) not cleared, drained, cultivated, etc
3. neglected; unusedunimproved resources

adj.1660s, “not made better,” from un- (1) “not” + past participle of improve. Sense of “not developed or taken advantage of” (of land) is recorded from 1781.